Other
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.u51b0040n&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #U51B-0040
Other
[1027] Geochemistry / Composition Of The Planets
Scientific paper
The surface of Mars has been extensively investigated and huge amount of data have been acquired such as high Res images. On the other hand interior of the Mars has been only weakly constrained by the mean density, the moment of inertia and gravity data. The size of core is poorly constrained and negatively correlated with the core density. High dissipation state is reported for the mantle by tidal interaction (Bills et al 2006), which is against a conventional view of small,cool planet. To clarify these points seismic observation on Mars is deadly needed. Japan Mars exploration project(MELOS) is now under discussion and it includes seismic measurements for determination the interior structure of Mars such as the core size, its state and attenuation in the mantle. Our plan is to install broadband high sensitivity seismometers,which are intended to detect continuous excitation of free oscillation by atmospheric turbulence. In this presentation we would like to show a basic design of broadband high sensitivity seismometer as well as environment protection designs. The basic parts are composed of a long period pendulum, laser interferometry and its control feedback electricity. As for the environment protection design,the following factors are important. 1. Surface condition. Martian surface is composed of stones gravels and sand. Drift is expected to occur due to the sudden change in ground slope. We need a device for self adjustment to keep the horizontal. 2. Temperature. Surface temperature at Martian equator is expected to vary between 190 to 300K. We have to consider changes in spring tension, thermal expansion of components and changes in circuit constants. 3. Surface wind. Inhomogeneously heated surface and topographic effect generate wind over 20m per second. We have to consider to lessen the effect of seismometer,even if we install the seismometer on the ground. 4. Radiation. Radiation that rains down on Mars is stronger because of thin atmosphere. Radiation causes damage in effects electrical circuit, causes material degradation and improper operating signals. We have to make provision. Surface wind seems to be the most important and specific problem. We are conducting wind tunnel experiments for efficient design of wind shelter over the seismometer. We will focus particularly on this test in detail in this meeting.
Araya Akito
Hori Toshihiro
Ishihara Yasuhide
Kakuma Hiroaki
Kobayashi Nami
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